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Genetic variation analysis of PCV1 strains isolated from Guangxi Province of China in 2015. | LitMetric

AI Article Synopsis

  • PCV1, initially thought to be harmless, has been found to cause lesions in pig fetuses, indicating a need for further study on its genetic variation and spread among domestic pigs.
  • In a study involving 247 tissue samples from piglets in Guangxi Province, 13 strains of PCV1 were sequenced, showing high nucleotide similarity among them and with existing reference strains.
  • The study identifies a recombinant strain (GXdx84) and a mutation in the capsid protein of another strain (GXyl224), providing new insights into PCV1 evolution and potential control measures.

Article Abstract

Background: Porcine circovirus type 1 (PCV1) was discovered in 1974 as a contaminant of a porcine kidney (PK-15) cell line and was generally accepted to be nonpathogenic. But recently it was shown to cause lesions in experimentally infected pig fetuses. Serological evidence and genetic studies suggested that PCV1 was widespread in domestic pigs. Thus, the molecular epidemiology and genetic variation of PCV1 are still necessary to understand.

Results: Here 247 tissue samples were collected from piglets in Guangxi Province, China and performed whole-genome sequencing of the PCV1 genome. Thirteen PCV1 strains were sequenced from the samples. Similarity analysis showed that there were 97.8% to 99.6% nucleotide similarity to each other and 97.1% to 99.8% nucleotide similarity to the 40 reference strains. Besides, based on sequence analysis, we found one putative recombinant virus named GXdx84 strain contained the open-reading frame 1 (ORF1) of PCV1 and the ORF2 of PCV2d-2, which was consistent with the results of phylogenetic analysis that compared PCV1 and PCV2 strains. Variation analysis of the amino acids of the capsid protein revealed that the GXyl224 strain, which encoded 235 amino acids, had two amino acids more than other strains. This is the first study to report that a cap gene mutation resulted in lengthening of in the gene sequence.

Conclusions: These data contribute to the understanding of PCV1 evolution and molecular epidemiology that will facilitate programs for its control and prevention.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5803923PMC
http://dx.doi.org/10.1186/s12917-018-1345-zDOI Listing

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